Find the right material for your next project. TerraBay Materials offers road base and crushed drain rock for driveways and site work, drain rock and permeable base for drainage projects, and quarry rock in a range of sizes. This category also includes utility sand, screened fill dirt, backfill materials, plaster sand, concrete sand and specialty backfill sandy loam top soil mixes. Browse the products above to compare sizes and material options. Product pages provide details to help you choose; if you need help selecting a material or estimating quantity, contact TerraBay before ordering. We deliver bulk materials to homes and job sites across our Bay Area service area. Delivery availability and fees depend on your location and order.